How can I configure the effects loop on my Fender® Mustang™ III-V (V.2) to match the function the Fender Mustang III-V (V.1)?
The Fender Mustang III-V (V2) amplifiers Effects Loop can be configured in several ways. If your Mustang III-V (V2) shipped with or is currently loaded with firmware version 2.0, the effects loop is fixed in the "pre amp" position. As of firmware version 2.1 and later, the effects loop is placed in the "post amp" position, and you are now able to switch the "Fx Loop Position" to either "Normal" or Looper Pedal" under the Utilities menu on your Fender Mustang III/IV/V (V.2).
This is desirable in particular for those who wish to use Looper pedals with the Fender Mustang III-V (V1) series amps where the effects loop is fixed in the "post amp" position. Please see the "Effects Loop Diagram" PDF via the Related Downloads section in this article.